This one -
No, it's not Mia just misunderstanding. THIS is her actually taking a fact that she learned (this food still tastes great even though it's 3 years old) and then using that fact in collaboration with other knowledge she has (the Empire doesn't have good food storage).
THEN she engages in diplomacy on the spot, ignoring (intentionally or not) any potential slight to herself to secure an agreement (while also accidentally indebting the 2nd rate princess through forgiveness and good intentions for the Empire)
THEN she brings the proposal to her chief administrative officer who can leverage this plan into action.
THIS IS NOT simply her misunderstanding and making things better. This is at least 80% her doing something useful all on her own.
She's really doing this as a proper royal.